body {
  margin: 0;
  background-color: #eee;
  font-size: 14px;
}

* {
  /* 移除掉默认的box-sizing: border-box属性，否则可能会影响以前开发的控件的样式 */
  /* box-sizing: border-box; */
  font-family: Arial, Helvetica, 'PingFang SC', 'Heiti SC', sans-serif;
}

#book-stage {
  position: relative;
  width: 960px;
  height: 720px;
  background-color: white;
  margin: 0 auto;
  overflow: hidden;
}

#book-stage > #book {
  width: 100%;
  height: 100%;
  position: relative;
}

#book > .page {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center center;
}

#book > .page strong,
#book > .page b {
  font-weight: 400;
}

/*
 * overwrite UA default style begin
 */
input {
  padding: 1px 2px;
  margin: 0;
  border-width: 2px;
  border-style: inset;
  border-color: rgb(118, 118, 118);
  border-image: initial;
}
/*
 * overwrite UA default style end
 */